JP4022529B2 - Trance - Google Patents

Description

  The present invention relates to a transformer in which a primary coil and a secondary coil are electrically insulated.

  In order to secure an insulation distance between the primary coil and the secondary coil, a transformer is proposed in which an insulating protrusion is provided on one flange portion of the bobbin (see Patent Document 1).

  FIG. 6 is a cross-sectional view showing an example of a conventional transformer. In FIG. 6, directions orthogonal to each other are represented by arrows X, Y, and Z. The direction of arrow X is the front side, the direction opposite to arrow X is the back side, the direction of arrow Y is the side, the direction of arrow Z is the upper side, and the direction opposite to arrow Z is the lower side.

  As shown in FIG. 6, the bobbin 10 has flange portions 102 and 103 at both ends of the winding portion 101. A primary coil C1 is wound around the winding portion 101, and a lead wire CP1 of the primary coil is drawn from the vicinity of the flange portion 102, connected to the pin terminal 104 through a groove provided in the flange portion 102, and Soldering is applied to the connecting portion between the lead-out line CP1 and the pin terminal 104. Further, the secondary coil C2 is further wound on the primary coil C1, the lead wire CP2 of the secondary coil C2 is drawn out from the vicinity of the flange portion 103, and is connected to the pin terminal 105 provided in the flange portion 102, Further, soldering is applied to the connecting portion between the lead-out line CP2 and the pin terminal 105. E-type cores E1 and E2 are mounted on the bobbin 10 from above and below as magnetic cores, and a predetermined magnetic circuit is formed.

  In general, various safety standards are defined for transformers according to applications and structures. For this reason, in the transformer as described above, an insulation distance between the primary coil C1 and the secondary coil C2 and an insulation distance between the E-type cores E1, E2 and the secondary coil C2 are ensured and safety standards are met. Must be met.

  Here, the insulation distance between the primary coil C1 and the secondary coil C2 passes from the end on the flange portion 102 side of the primary coil C1 through the upper surface on the pin terminal 105 side and the front surface on the flange portion 102. Thus, the distance A reaches the pin terminal 105 on the lower surface.

In the transformer of FIG. 6, by projecting the pin terminal 105 side of the flange portion 102 in the direction of arrow B, even when a part of the covering of the lead wire CP2 is melted during soldering, a predetermined insulation distance A is set. Can be secured. This makes it possible to manufacture a transformer with a low height while ensuring a sufficient insulation distance A.
JP 2001-76942 A

  In recent years, with the miniaturization of electronic devices, further miniaturization of transformers has been demanded. However, in the above transformer, although it was possible to reduce the height dimension, it was difficult to reduce the dimension in the front-rear direction.

An object of the present invention is to provide a transformer that can be further reduced in size while sufficiently securing an insulation distance between a secondary coil and a magnetic core.

The transformer according to the present invention can be attached to a predetermined attachment surface, and has a winding portion disposed substantially parallel to the attachment surface and first and second flange portions formed at both ends of the winding portion. A bobbin, first and second coils wound around the winding portion, and a plurality of first pin terminals provided on the lower surface of the first flange portion to which lead wires of the first coil are connected A plurality of second pin terminals provided on the lower surface of the second flange portion, to which lead wires of the second coil are connected, a magnetic core attached to the bobbin, and attached to a lower portion of the second flange portion. An insulating member formed so as to extend to the upper portion of the second flange portion, and the second flange portion has an insulating recess on the lower side on the side surface opposite to the winding portion, and for insulation The member has an insulating convex part that fits into the insulating concave part, and is insulated The member is attached to the second flange portion so that the insulating convex portion fits into the insulating concave portion, and the lead wire of the second coil is drawn from the upper side of the second flange portion, and the insulating member It is connected to the second pin terminal through the surface opposite to the second flange portion, and the insulating concave portion and the insulating convex portion are insulated from the shortest insulating distance between the magnetic core and the second pin terminal. It fitted so that the distance through the bottom of the use recess is shall.

In the transformer according to the present invention, the second flange portion has an insulating concave portion on the lower side on the side opposite to the winding portion, and the insulating convex portion of the insulating member is fitted into the insulating concave portion. The

  In this case, the insulation distance between the magnetic core and the second pin terminal can be increased by the inner surface of the insulating recess. Thereby, the insulation distance between the magnetic core and the second pin terminal can be sufficiently ensured without increasing the height of the second flange portion. As a result, it is possible to reduce the dimension in the height direction of the transformer while ensuring a sufficient insulation distance between the second coil and the magnetic core.

The insulating member is formed so as to extend to the top of the second flange portion, the lead wire of the second coil, the upper side of the second flange portion and the second passes over the surface of the insulating member Guided to pin terminals.

  In this case, even if the coating near the second pin terminal of the lead wire of the second coil melts, a sufficient insulation distance can be secured.

  An insulating ridge extending along the alignment direction of the second pin terminals may be provided between the winding portion and the second pin terminal on the lower surface of the second flange portion.

  In this case, the insulation distance between the first coil and the second pin terminal can be increased by the side surface of the insulating ridge portion on the winding portion side. Thereby, the insulation distance between the first coil and the second pin terminal can be sufficiently ensured without increasing the horizontal dimension of the second flange portion. as a result. It is possible to reduce the horizontal dimension while ensuring a sufficient insulation distance between the first coil and the second coil.

  An insulating groove extending along the alignment direction of the second pin terminal and capable of fitting an insulating protrusion is provided between the winding portion and the second pin terminal on the lower surface of the second flange portion. Also good.

  In this case, the insulation distance between the first coil and the second pin terminal can be increased by the inner surface of the insulating groove. Thereby, the insulation distance between the first coil and the second pin terminal can be sufficiently ensured without increasing the horizontal dimension of the second flange portion. as a result. It is possible to reduce the horizontal dimension of the transformer while ensuring a sufficient insulation distance between the first coil and the second coil.

  The insulating member may have a heat radiating convex portion, and may be locked so that the lead wire of the second coil extends along the side surface of the heat radiating convex portion. In this case, when the lead wire of the second coil is soldered to the second pin terminal, the heat transmitted from the second pin terminal to the lead wire of the second coil can be moved to the heat radiating convex portion. it can. Thereby, the lead wire of the second coil is dissipated, and the melting of the coating can be stopped at the position of the heat radiating convex portion.

  The heat radiating convex portion may have a curved side surface. In this case, since the lead wire of the second coil is guided along the curved side surface of the heat radiating convex portion, the lead wire of the second coil is engaged with the heat radiating convex portion with a relatively large tension. Even when stopped, it is possible to prevent a high stress concentration from occurring on the contact surface of the lead wire of the second coil with the heat radiating convex portion. Accordingly, the lead wire of the second coil can be brought into close contact with the side surface of the heat radiating convex portion while preventing the break of the lead wire of the second coil, and the contact surface can be enlarged. As a result, a higher heat dissipation effect can be obtained.

  The insulating member may have a protective protrusion extending in the vertical direction. In this case, the machine or the like is prevented from coming into contact with the lead wire of the second coil during assembly work or the like. Thereby, it is possible to prevent breakage of the lead wire of the second coil.

In the present invention, it is possible to lengthen the insulation distance by the inner surface of the insulating recess, to provide a further size reduction is possible trans while sufficiently secure the insulation distance between the secondary coil and the magnetic center Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention. 2 is a front view of the transformer shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of the transformer shown in FIG. 1 to 3, directions orthogonal to each other are represented by arrows X, Y, and Z. The direction of arrow X is the front side, the direction opposite to arrow X is the back side, the direction of arrow Y is the side, the direction of arrow Z is the upper side, and the direction opposite to arrow Z is the lower side.

  The transformer shown in FIGS. 1 to 3 includes a bobbin B1, a primary coil C1, a secondary coil C2, E-type cores EC1 and EC2, pin terminals P11 to P15, P21, and P22, and an insulating member S.

  The bobbin B1 includes a winding part B2 around which the primary coil C1 and the secondary coil C2 are wound, a flange part FL1 formed at the end on the back side of the winding part B2, and the front side of the winding part B2. And a flange portion FL2 formed at the end portion. The bobbin B1 is integrally formed of an insulating material such as plastic.

  A projecting portion T1 projecting toward the back side is formed at the lower portion of the flange portion FL1. A guide groove (not shown) for guiding the lead wire CP1 of the primary coil C1 is formed in the protruding portion T1. Pin terminals P11 to P15 are implanted on the lower surface of the protruding portion T1 by press-fitting or integral molding.

  An insulating projecting portion T2 projecting toward the front side is formed at the lower portion of the flange portion FL2. Two pin terminals P21 and P22 are implanted on the lower surface of the insulating protrusion T2 by press-fitting or integral molding. A rectangular insulating recess T3 is formed in front of the insulating protrusion T2 so as to extend in the direction of the arrow Y. On the lower surface of the insulating protrusion T2, a U-shaped insulating protrusion T4 is formed so as to surround the back side and the side surface of the pin terminals P21 and P22. Guide grooves R1 and R2 for guiding the lead wire CP2 of the secondary coil C2 are formed in the upper portion of the flange portion FL2.

  The bobbin B1 is provided with E-type cores EC1 and EC2 that are magnetic cores from the back side and the front side, respectively, thereby forming a predetermined magnetic circuit. The shape of the core and the like are not particularly limited to this example, and a core having another shape such as a combination of an E-type core and an I-type core may be used.

A rectangular insulating projection T5 is formed in the lower part on the back side of the insulating member S so as to extend in the direction of the arrow Y. Insulating projection T5 insulating member S to be fitted in the insulating recess T 3 is mounted on the front side of the insulating protrusion T 2 and E-type core EC 2. In the vicinity of the center on the front side of the insulating member S, a long heat radiation convex portion T6 is formed so as to extend in the direction of the arrow Y. Both side surfaces of the heat radiation convex portion T6 are formed in an arcuate curved surface. Further, in the lower part on the front side of the insulating member S, heat radiation convex portions T7 and T8 having a substantially triangular shape are formed. The corners on the inner side surfaces of the heat radiating convex portions T7 and T8 are formed in an arc shape, and are arranged so as to be located inside the side surfaces on both sides of the heat radiating convex portion T6.

  Furthermore, protective protrusions T9 and T10 are formed in the vicinity of both side surfaces of the insulating member S so as to extend vertically. The insulating member S is integrally formed of an insulating material such as plastic.

  For example, an electric wire such as an enameled wire is used as the primary coil C1. The primary coil C1 is wound around the winding portion B2, the lead wires CP1 at both ends are drawn out from the vicinity of the flange portion FL1, pass through the guide groove, and are soldered and connected to the pin terminals P12 and P14.

  For example, a three-layer insulated wire is used as the secondary coil C2. The secondary coil C2 is further wound on the primary coil C1. One lead wire CP2 of the secondary coil C2 is drawn out from the vicinity of the flange portion FL2 through the guide groove R1, and on the surface of the insulating member S, one side surface of the heat radiation convex portion T6 and the heat radiation convex portion T7. It is locked by the heat radiation convex portions T6 and T7 along the inner side surface and soldered to the pin terminal P21. The other lead line CP2 is drawn out from the vicinity of the flange portion FL2 through the guide groove R2, and extends along the one side surface of the heat radiation convex portion T6 and the inner side surface of the heat radiation convex portion T8 on the surface of the insulating member S. In this way, it is locked by the heat radiation convex portions T6 and T8 and soldered to the pin terminal P22.

  At this time, the vicinity of the pin terminals P21 and P22 of the lead-out line CP2 becomes high temperature by soldering, and the covering of the lead-out line CP2 is melted. The heat transmitted from the pin terminals P21 and P22 to the lead wire CP2 moves to the heat radiation convex portions T6, T7, and T8 through the contact surfaces with the heat radiation convex portions T6, T7, and T8. That is, the lead wire CP2 is radiated by the heat radiating convex portions T6, T7, T8. Thereby, melting of the coating by soldering of the lead wire CP2 can be stopped at the position of the heat radiation convex portions T7, T8 or the heat radiation convex portion T6.

  The shortest distance L between the heat radiation convex portion T6 and the E-type core EC2 shown in FIG. 1 is set so as to ensure a predetermined insulation distance. Thereby, even when the coating of the lead wire CP2 is melted to the position of the heat radiation convex portion T6, the insulation distance between the E-type core EC2 and the secondary coil C2 is sufficiently secured.

  Further, the heat radiation convex portions T6, T7, and T8 have curved side surfaces. In this case, even when the lead wire CP2 is locked to the heat radiation convex portions T6, T7, T8 with a relatively large tension, a high stress concentration is caused on the contact surface of the lead wire CP2 with the heat radiation convex portions T6, T7, T8. Is prevented from occurring. Accordingly, the lead wire CP2 can be brought into close contact with the side surfaces of the heat radiation convex portions T6, T7, T8 while preventing the breakage of the lead wire CP2, and the contact surface can be enlarged. As a result, a higher heat dissipation effect can be obtained.

  Furthermore, protective protrusions T9 and T10 extending vertically are provided on both sides of the lead-out line CP2. This prevents the machine or the like from coming into contact with the lead-out line CP2 during assembly work or the like. As a result, disconnection of the lead line CP2 can be prevented.

  The bobbin B1 is attached to the circuit board W as shown in FIG. In this case, the circuit board W is provided with a hole having a shape corresponding to the insulating protrusion T4. The insulating protrusion T4 is inserted into the hole of the circuit board W.

  When the coating of the lead wire CP2 is melted by the distance L1 shown in FIG. 3 by soldering, the shortest insulation distance between the E-type cores EC1 and EC2 and the secondary coil C2 is the end portion on the front side of the E-type core EC2. To the upper surface of the insulating projection T2, the upper surface of the insulating recess T3 on the front side, the upper horizontal surface in the insulating recess T3, the vertical and lower horizontal surfaces, the lower side of the insulating recess T3 on the front side. The distance L2 reaches the lower end of the insulating protrusion T2 via the surface. Thus, the insulation distance can be increased by the inner surface of the insulation recess T3, so that a predetermined insulation distance can be secured while reducing the vertical dimension of the bobbin B1.

In addition, the shortest insulation distance between the primary coil C1 and the secondary coil C2 is the surface on the back side of the insulating protrusion T2 from the end on the front side of the primary coil C1, and the back surface of the protruding protrusion T4. the distance L3 reaching the pin terminal P 22 through the surface and the lower surface side. In this way, the insulation distance can be increased by the surface on the back side of the insulating protrusion T4, so that a predetermined insulation distance can be ensured while reducing the dimension in the front direction of the bobbin B1.

  As described above, in the transformer according to the present embodiment, the insulating distance can be increased by forming the insulating concave portion T3 and the insulating convex portion T4 in the insulating protruding portion T2, so that the bobbin B1 The vertical and front-back dimensions can be reduced.

  In the present embodiment, the insulating protrusion T2, the insulating recess T3, the insulating protrusion T4, and the insulating member S are provided on the lower side of the flange portion FL2, but a three-layer insulated wire is provided in the primary coil. Insulating protrusions, insulating recesses, insulating ridges, and insulating members may also be provided on the lower side of the flange portion FL1.

  Further, in the transformer according to the present embodiment, the insulating protrusion T4 is provided on the lower surface of the insulating protrusion T2, but as shown in FIG. 4, the pin terminal P21 is provided on the lower surface of the insulating protrusion T2. , 22 may be formed with a U-shaped insulating groove T11 so as to surround the back surface side and the side surface side. In this case, an insulating protrusion T12 is formed on a housing of a power supply device or the like in which the transformer is disposed, and the transformer is attached to the circuit board W so that the insulating protrusion T12 fits into the insulating groove T11. As a result, the insulation distance between the primary coil C1 and the secondary coil C2 is such that the front surface side end of the primary coil C1 and the back surface of the insulating protrusion T2 and the back surface of the insulating groove T11 on the bottom surface. The distance L4 reaches the pin terminal P22 through the front surface, the vertical surface on the back surface in the insulating groove T11, the horizontal surface and the vertical surface on the front surface, and the front surface of the insulating groove T11 on the lower surface. As described above, since the insulation distance can be increased by the inner surface of the insulating groove T11, a predetermined insulation distance can be ensured while reducing the longitudinal dimension of the bobbin B1.

  Note that the shape and size of the insulating recess T3, the insulating protrusion T4, and the insulating protrusion T5 are not limited to the illustrated shape and size as long as an insulation distance that satisfies safety standards can be secured. The insulating concave portion T3 and the insulating convex portion T5 may have a front shape of a circle, an ellipse, a trapezoid or other shapes, and may have a curved shape such as an arc shape in cross section. Moreover, the protruding protrusion T4 for insulation is not limited to a U-shape, and may be a linear shape, a curved shape, or other shapes.

  The shape and size of the heat radiating convex portions T6, T7, and T8 are not limited to the shape and size shown in the figure, and other shapes such as a circle, an ellipse, a substantially rectangle, etc. It may be in shape and size.

  The number of pin terminals is not particularly limited to the above example. Further, from the viewpoint of assemblability and the like, an insulating tape or the like may be added between the primary coil and the secondary coil, the surface of the secondary coil, or the like. Also, the numbers of primary coils and secondary coils are not particularly limited to the above example, and a plurality of primary coils and secondary coils may be used.

  In the present embodiment, the flange portion FL1 corresponds to the first flange portion, the flange portion FL2 corresponds to the second flange portion, the primary coil C1 corresponds to the first coil, and the secondary coil C2. Corresponds to the second coil, the pin terminals P11 to P15 correspond to the first pin terminal, the pin terminals P21 and 22 correspond to the second pin terminal, and the E-type cores EC1 and EC2 correspond to the magnetic core. The insulating member S corresponds to the insulating member, the insulating concave portion T3 corresponds to the insulating concave portion, the insulating convex portion T5 corresponds to the insulating convex portion, and the insulating convex portion T4 corresponds to the insulating convex portion. The insulating groove portion T11 corresponds to the insulating groove portion, the insulating protrusion portion T12 corresponds to the insulating protrusion portion, and the heat radiation convex portions T6, T7, and T8 correspond to the heat radiation convex portion. The protective protrusions T9 and T10 correspond to the protective protrusions.

( Reference form )
FIG. 5 is a cross-sectional view of a transformer of a reference form .

  In FIG. 5, directions orthogonal to each other are represented by arrows X, Y, and Z. The direction of arrow X is the front side, the direction opposite to arrow X is the back side, the direction of arrow Y is the side, the direction of arrow Z is the upper side, and the direction opposite to arrow Z is the lower side.

  The transformer shown in FIG. 5 includes a bobbin B11, a primary coil C1, a secondary coil C2, E-type cores E1 and E2, pin terminals P31 and P32, and an insulating member S1.

Bobbin B11 includes a winding portion B12 which primary coil C1 and the secondary coil C2 is wound, and a flange portion FL11 formed at the lower end of the winding portion B12, it is formed on top of the winding portion B 12 It consists of a flange part FL12. The bobbin B11 is integrally formed of an insulating material such as plastic.

  On the back side of the flange portion FL11, a protruding portion T21 that protrudes toward the back side beyond the winding thicknesses of the primary coil C1 and the secondary coil C2 is formed. A guide groove (not shown) for guiding the lead wire CP1 of the primary coil C1 is formed in the protruding portion T21. A plurality of pin terminals P31 are implanted on the lower surface of the projecting portion T21 by press-fitting or integral molding.

  On the front side of the flange portion FL11, an insulating protrusion T22 that protrudes toward the front side beyond the thickness of the primary coil C1 and the secondary coil C2 is formed. A plurality of pin terminals P32 are implanted on the lower surface of the insulating protrusion T22 by press-fitting or integral molding. A rectangular insulating recess T23 is formed in front of the insulating protrusion T22 so as to extend in the direction of the arrow Y. On the lower surface of the insulating protrusion T22, a U-shaped insulating protrusion T24 is formed so as to surround the back side and the side surface of the pin terminal P32.

  A plurality of guide grooves (not shown) for guiding the lead wire CP2 of the secondary coil C2 are formed on the front side of the flange portion FL12. Further, a plurality of cylindrical guide convex portions G1 for locking the lead wire CP2 of the secondary coil C2 are formed at the end portion of the upper surface on the front side of the flange portion FL12.

  The bobbin B11 is provided with E-type cores E1 and E2 that are magnetic cores from above and below, and a predetermined magnetic circuit is configured. The shape of the core and the like are not particularly limited to this example, and a core having another shape such as a combination of an E-type core and an I-type core may be used.

A rectangular insulating projection T25 is formed to extend in the direction of the arrow Y at the lower part on the back side of the insulating member S1. Insulating member S1 is mounted on the front side of the bobbin B11 to fit insulating recess T 23. Near the center of the front side of the insulating member S1, the same heat radiation convex portion T6 as in FIG. 1 is formed. Further, the same heat radiation convex portions T7 and T8 as those in FIG. 1 are formed in the lower portion on the front side of the insulating member S1.

  Furthermore, protective ridges T9 and T10 that are the same as those in FIG. 1 are formed in the vicinity of both side surfaces of the insulating member S1 so as to extend vertically. The insulating member S1 is integrally formed of an insulating material such as plastic.

  For example, an electric wire such as an enameled wire is used as the primary coil C1. The primary coil C1 is wound around the winding part B12, the lead wires CP1 at both ends are drawn out from the vicinity of the flange part FL11, pass through the guide groove, and are soldered and connected to the pin terminal P31.

For example, a three-layer insulated wire is used as the secondary coil C2. The secondary coil C2 is further wound on the primary coil C1. One lead line CP2 of the secondary coil C2 is drawn from the vicinity of the flange portion FL12 through the guide groove and locked to the guide convex portion G1, and then one of the heat radiating convex portions T6 on the surface of the insulating member S1. The heat radiation convex portions T6 and T7 are locked along the side surface and the inner side surface of the heat radiation convex portion T7, and soldered to the pin terminal P32. The other lead wire CP2, after being locked to be drawn through the guide groove from the vicinity of the flange portion FL12 guide projections G1, side and heat dissipation of other side of the radiating convex portion T6 on the surface of the insulating member S1 The heat radiation convex portions T6 and T8 are locked along the inner side surface of the convex portion T8 and soldered to the pin terminal P32.

  At this time, the vicinity of the pin terminal P32 of the lead wire CP2 becomes high temperature due to soldering, and the coating of the lead wire CP2 is melted. The heat transmitted from the pin terminal P32 through the lead wire CP2 moves to the heat radiation convex portions T6, T7, T8 through the contact surface with the heat radiation convex portions T6, T7, T8. That is, the lead wire CP2 is radiated by the heat radiating convex portions T6, T7, T8. Thereby, melting of the coating by soldering of the lead wire CP2 can be stopped at the position of the heat radiation convex portions T7, T8 or the heat radiation convex portion T6.

  A distance L10 from the heat radiation convex portion T6 shown in FIG. 5 to the end portion of the primary coil C1 on the flange portion FL12 side through the surface of the insulating member S1 and the upper surface of the flange portion FL12 has a predetermined insulation distance. It is set to be secured. Thereby, even when the coating of the lead wire CP2 is melted to the position of the heat radiation convex portion T6, a sufficient insulation distance is ensured between the primary coil C1 and the secondary coil C2.

  The bobbin B11 is attached to the circuit board W as shown in FIG. In this case, the substrate W is provided with a hole having a shape corresponding to the insulating protrusion T24. The insulating protrusion T24 is inserted into the hole of the circuit board W.

  When the coating of the lead wire CP2 of the secondary coil C2 is melted by the distance L11 shown in FIG. 5 by soldering, the shortest insulation distance between the primary coil C1 and the secondary coil C2 is for insulation of the primary coil C1. Insulation on the upper surface of the insulating protrusion T22 from the end on the protrusion T22 side, the upper surface of the insulating recess T23 on the front side, the upper horizontal plane in the insulating recess T23, the vertical and lower horizontal planes, and the front side The distance L12 reaches the lower end of the insulating protrusion T22 through the lower surface of the recess T23. Thus, since the insulation distance can be increased by the inner surface of the insulating recess T23, the vertical dimension of the bobbin B11 can be reduced.

Further, the shortest insulation distance between the E-type cores E1 and E2 and the secondary coil C2 is that the surface on the back side of the projecting portion T22 for insulation from the lower end of the E-type core E2, the surface on the back side of the protruding projection T24, and The distance L 13 reaches the pin terminal P 32 through the lower surface. Thus, since the insulation distance can be increased by the surface on the back side of the insulating protrusion T24, the dimension of the bobbin B11 in the front-rear direction can be reduced.

As described above, in the transformer according to the present embodiment , since the insulating recess T23 and the insulating protrusion T24 are formed in the insulating protrusion T22 to increase the insulating distance, the vertical direction and the front-rear direction of the bobbin B11 The dimension of can be reduced.

In this preferred embodiment, the insulating protrusion T22 on the front side of the flange portion FL11, insulating recess T23, is provided with the insulating ridges T24 and the insulating member S1, three-layer insulated wire in the primary coil insulating protrusions also on the rear side of the flange portion FL11 using, insulating concave portion may be provided with insulating convex portion and the insulating member.

Further, instead of providing the insulating protrusion T24 in the transformer of FIG. 5, an insulating groove such as the insulating groove T11 of FIG. 4 may be formed. In this case, as the transformer forms the insulating projections, such as the insulating projections T 12 of FIG. 4 in a housing such as a power device which is arranged, the insulating protrusion is fitted into the groove insulation A transformer is attached to the circuit board W. As a result, since the insulation distance can be increased by the inner surface of the insulating groove, a predetermined insulation distance can be ensured while reducing the longitudinal dimension of the bobbin B11.

  The shape and size of the insulating recess T23, the insulating protrusion T24, and the insulating protrusion T25 are not limited to the illustrated shape and size as long as an insulation distance that satisfies the safety standard can be secured. The insulating concave portion T23 and the insulating convex portion T25 may have a front shape of a circle, an ellipse, a trapezoid or other shapes, and may have a curved shape such as an arc shape in cross section. Further, the insulating ridge portion T24 is not limited to the U-shape, and may be a linear shape, a curved shape, or other shapes.

  The shape and size of the heat radiating convex portions T6, T7, T8 are not limited to the shape and size shown in the figure, and other shapes such as a circle, an ellipse, a substantially rectangle, etc. It may be in shape and size.

  The number of pin terminals is not particularly limited to the above example. Further, from the viewpoint of assemblability and the like, an insulating tape or the like may be added between the primary coil and the secondary coil, the surface of the secondary coil, or the like. Also, the numbers of primary coils and secondary coils are not particularly limited to the above example, and a plurality of primary coils and secondary coils may be used.

  The transformer according to the present invention can be used for power supply equipment and the like.

It is a perspective view which shows an example of the trans | transformer which concerns on this Embodiment. FIG. 2 is a front view of the transformer shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line AA of the transformer shown in FIG. 2. It is sectional drawing which shows the other example of the trans | transformer which concerns on this Embodiment. It is sectional drawing which shows the example of the transformer of a reference form . It is sectional drawing which shows the example of the conventional transformer.

Explanation of symbols

B1 Bobbin B2 Winding part FL1, FL2, FL11, FL12 Flange part C1 Primary coil C2 Secondary coil EC1, EC2, E1, E2 E type core P11-P12, P21-P22, P31, P32 Pin terminal S, S1 Insulation Member T3, T23 Insulating Concavity T5, T25 Insulating Convex T6 to T8 Heat Dissipating Convex T9, T10 Protective Protrusions T11 Insulating Groove T12 Insulating Protrusions W Circuit Board

Claims (6)

A transformer that can be mounted on a predetermined mounting surface,
A bobbin having a winding portion disposed substantially parallel to the mounting surface and first and second flange portions formed at both ends of the winding portion;
First and second coils wound around the winding portion;
A plurality of first pin terminals provided on a lower surface of the first flange portion to which lead wires of the first coil are connected;
A plurality of second pin terminals provided on a lower surface of the second flange portion to which lead wires of the second coil are connected;
A magnetic core attached to the bobbin;
An insulating member attached to a lower portion of the second flange portion and formed to extend to an upper portion of the second flange portion;
The second flange portion has an insulating recess on the lower side on the side surface opposite to the winding portion,
The insulating member has an insulating convex portion that fits into the insulating concave portion,
The insulating member is attached to the second flange portion so that the insulating convex portion fits into the insulating concave portion,
The lead wire of the second coil is pulled out from the upper side of the second flange portion, and is connected to the second pin terminal through the surface opposite to the second flange portion of the insulating member. It is,
The insulating recess and the insulating protrusions, the fitted Rukoto as the shortest insulating distance is the distance through the bottom surface of the insulating recess between said core second pin terminal Characteristic transformer. An insulating ridge extending along the alignment direction of the second pin terminal is provided between the winding portion and the second pin terminal on the lower surface of the second flange portion. The transformer according to claim 1. An insulating groove that extends along the alignment direction of the second pin terminal and can be fitted with an insulating protrusion between the winding portion and the second pin terminal on the lower surface of the second flange portion The transformer according to claim 1, wherein a transformer is provided. Said insulating member has a radiating convex portions, according to claim 1 to 3 in which the lead lines of the second coil, characterized in that the locked along the side surface of the heat radiating convex portion Trans in any one of. The transformer according to claim 4, wherein the heat radiating convex portion has a curved side surface. It said insulating member is a transformer according to any one of claims 1 to 5, characterized in that it has a protective ridge extending vertically.

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